Broad Peak LED Light Source for Color Rendering and Melatonin Control
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Solution Overview
Problem
Conventional light source apparatuses with sharp peak wavelengths for red, green, and blue light emitters face a trade-off between high melatonin suppressing efficiency and good color rendering property, where a shift in peak wavelengths deteriorates color rendering index (Ra), indicating a need for a solution that balances these factors.
Innovation Solution
A light source apparatus with broad peak wavelengths for red (600-660 nm), green (530-570 nm), and blue (420-470 nm) light emitters, utilizing light emitting diodes and a color converting member such as an optical multi-layered film or fluorescent material to absorb visible light components below 480 nm, thereby improving color rendering property while reducing melatonin suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light emitters with sharp peak wavelengths are used, then melatonin suppressing efficiency is high, but color rendering property deteriorates
Solution Approach 1:
The patent segments the spectral power distribution into multiple bands by using multiple light emitters with different peak wavelengths (first light emitter: 600-660nm, second light emitter: 530-570nm, third light emitter: 420-470nm). Each emitter contributes to different portions of the spectrum, collectively achieving both good color rendering and controlled melatonin suppression through the broad combined spectrum rather than relying on a single sharp peak
Solution Approach 2:
The patent employs a composite approach by combining multiple light emitting diodes with different spectral characteristics. The composite spectral power distribution created by superimposing multiple broad peaks achieves superior color rendering while the specific wavelength ranges selected optimize melatonin suppression efficiency
2Loss of energy
If peak wavelength is shifted to lower melatonin suppressing efficiency, then color rendering index (Ra) is lowered
Solution Approach 1:
The patent changes the key parameter from sharp peak wavelength to broad spectral distribution. By defining light emitters with wavelength ranges at half peak intensity wider than specific ranges (first light emitter: wider than 600-660nm, second light emitter: wider than 530-570nm), the system achieves robust color rendering that is insensitive to peak wavelength variations while maintaining controlled melatonin suppression through the selected spectral ranges
3Manufacturing precision
If light emitters with broad peak wavelengths are used, then color rendering property is improved, but melatonin suppressing efficiency increases
Solution Approach 1:
The patent applies local quality by strategically selecting which spectral regions to emphasize and which to suppress. The first and second light emitters use broad peaks for excellent color rendering, while the third light emitter targets the 420-470nm range specifically to control melatonin suppression. The spectral power distribution is locally optimized in different wavelength regions to achieve the dual objective
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances color rendering property without suppressing melatonin production, offering a balanced performance suitable for normal illumination by broadening the color temperature range and effectively excluding wavelength components that induce melatonin suppression.
Implementation Method 1
a color converting member such as an optical multi-layered film or fluorescent material to absorb visible light components below 480 nm
Implementation Method 2
using light emitting diodes (LEDs)
Data Source
AI summary
A light source apparatus includes a first light emitter, a second light emitter, and a third light emitter. The first light emitter has a peak wavelength within the range from 600 nm to 660 nm and a wavelength range at half peak intensity wider than the range from 600 nm to 660 nm, the second light emitter has a peak wavelength within the range from 530 nm to 570 nm and a wavelength range at half peak intensity wider than the range from 530 nm to 570 nm, and the third light emitter which a peak wavelength is 420 nm-470 nm in a spectral power distribution thereof.